either alternating or direct. The filamentis a composition formed by mixing rare earths witha hfghly infusible body. As is well known, rareearths when heated to the approximate temperatureof the incandescent lamp give a blinding, brilliantlight, comparable in whiteness with the lime light orcarbon… … Fig. 5.—Six Glower Lamp—Out Door Type. together with its high efficiency, commend the Nernstlamp strongly to the lighting world. Depending asit does solely upon the heating power of the current,it can be used on circuits of 3,000 alternations. This
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